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Annals of Botany 81: 61-66, 1998
© 1998 Annals of Botany Company

Cell Walls of Seed Hairs fromLygeum spartum: Ultrastructure, Composition and Mechanical Properties

N. ZERIAHENE,, R. PRAT, R. GOLDBERG, A. M. CATESSON+, and M. HARCHE-KAID+,

Institut Jacques Monod, 2 Place Jussieu, F-75251, Paris, Cedex 05, France Physiologie végétale appliquée, Université Pierre et Marie Curie, 4 Place Jussieu, F-75252, Paris, Cedex 05, France Université des Sciences et de la Technologie, BP 1505, El Mnaouar, 31000, Oran, Algeria

May 6, 1997 ; August 25, 1997 . September 12, 1997 .

The silky hairs covering the whole surface ofLygeum spartumdispersal units are unicellular, unlignified epidermal structures whose length varies from 5 to 17 mm. The cell walls present a stratified texture after extraction of matrix material. Their composition depends on the geographical origin of the grasses. Polysaccharides extracted with boiling water represent approx. 18% of the cell wall dry matter in samples harvested in Algerian arid high-plateaus and only 3% in samples harvested in semi-arid coastal zones. In the latter case, hemicellulose and cellulose contents amounted to approx. 50 and 40%, respectively. Slightly lower values were found in high-plateau samples. Cinnamic acids were detected only in coastal region specimens which exhibited a higher mechanical resistance and a lower extensibility. These results support the existence of two distinct populations colonizing arid or semi-arid areas respectively.Copyright 1998 Annals of Botany Company

Cell wall; extensibility; polysaccharides;Lygeum spartum; seed hairs.


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